Which is right?

Which is right? And please tell me the reason that is wrong. Thank you.

1. Do you worry about what he did?

2. I am worried about that you are not doing fine.

3. He worried about how to do it.

4. They are worrying when to go to the train station.

5. Tina is reading a book that is about a poor girl borrowed from the library.

6. Tina is reading a book, which is about a poor girl, borrowed from the library.

7. Tina is reading a book, that is about a poor girl, borrowed from the library.